- More than 4 prior chemotherapy regimens; note: repeat use of regimens count as 1 prior regimen; switching front-line therapy regimens (for example, from intraperitoneal to intravenous therapy) for reasons other than progression will count as 1 prior therapy; bevacizumab and other 'targeted' agents will count in the total number of prior regimens; vaccine therapies will not count in the total of prior therapies